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Blog The  Workbench: Building a Benchtop Power Supply
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EMI-Reduction-Techniques
Engagement
  • Author Author: CharlesGantt
  • Date Created: 2 Jun 2015 10:35 PM Date Created
  • Views 1362 views
  • Likes 4 likes
  • Comments 4 comments
  • MakersWorkBench
  • the
  • psu
  • diy
  • benchtop
  • tools
  • supply
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Related
Recommended

The  Workbench: Building a Benchtop Power Supply

CharlesGantt
CharlesGantt
2 Jun 2015

I would like to introduce everyone to a new project I am working on. Meet The Workbench, a new web series that is designed to showcase DIY projects, EE tools and hardware, and general Maker - DIY projects. The series is being produced, and hosted by myself, and will start off as a twice per month video series, with releases increasing as it picks up momentum.

 

This weeks episode follows me along as I build a DIY benchtop power supply from a kit produced by Sparkfun, and a 650W PC PSU from BeQuiet.  Remember to head over to YouTube and subscribe to our channel and well as giving the video a thumbs up. Please feel free to share the video on your social media and with anyone you think might be interested. The more viewers I get, the easier it will be to begin a weekly release schedule! This episode's show notes can be found on the videos YouTube page.

 

There is some controversy with a PC PSU based power supply as many people believe that they are noisy, unfused, and just bad power units in general. While that is true for the 200-300 watt unit you might pull from an old Dell or HP, a high-end gaming power supply like the one in this video has a ripple of less than 2mv and is fused pretty well. BeQuiet is known to be one of the best high-end PSU manufacturers on the market and I have owned, reviewed, and torn down dozens over the last few years, and they have all oozed quality. They utilize top-shelf capacitors from companies like Teapo, Nichicon Chemicon, etc, and their PCBs are always well laid out. Besides, this project is designed to power small maker projects such as Arduino and Raspberry Pi based things, and not to power a high-precision circuit that is hooked up to your scope.

 

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Top Comments

  • DAB
    DAB over 10 years ago +1
    Good soldering technic. Your finished joints look good and clean. Are you going to show how well the supply works under load? I have always wondered how good the regulation is on a computer supply. DA…
  • artful_bodger
    artful_bodger over 10 years ago

    If you want a really simple FET based variable current dummy load, google 'design showcase dummy load' - it should take you to a pdf, which was a National Semi 'design showcase'

    You can use pretty much any FETs and parallel them up.  I used a CA3140 opamp off 5V to 16V, and 2 IRFZ46N in parallel. You need a big heatsink, as all the input power is 'wasted' by the FETs.  I use mine up to 50V/12A, but no more than 100W continuous. Elektor did something slicker, with warning LEDs etc, in Feb 2012.  By moving the voltage reference from the precision ref to a potential divider on the input test voltage, you get a constant resistance unit.

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  • Former Member
    Former Member over 10 years ago

    Interesting project, good luck.

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  • CharlesGantt
    CharlesGantt over 10 years ago in reply to DAB

    Thanks DAB, unfortunately I do not have a proper load tester, but I will load it down with some LED strips later this week and report back.

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  • DAB
    DAB over 10 years ago

    Good soldering technic.

     

    Your finished joints look good and clean.

     

    Are you going to show how well the supply works under load?

     

    I have always wondered how good the regulation is on a computer supply.

     

    DAB

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